Use Your Understanding of the Theory Behind the Investigation Together with Your Understanding

Gravimetric analysis of lawn fertiliser: part 1

Aim: What is your purpose in conducting this experiment? Materials: Check the box for material that you will need to complete this experiment.

burette fertiliser 10 mL measuring cylinder distilled water 50 mL measuring cylinder 2 M hydrochloric acid sintered glass crucible 10 M hydrochloric acid filter paper 0.25 M barium sulfate filter funnel 2 M barium sulfate Buchner flask and hose 0.25 M barium chloride 3 x 250 mL beakers 2 M barium chloride 3 x 250 mL volumetric flasks 0.25 M barium phosphate retort stand 2 M barium phosphate clamps and boss heads insert anything else you need Pasteur pipette insert anything else you need 25 mL pipette electronic balance thermometer glass stirring rod boiling chips separating flask oven desiccator hot plate Bunsen burner, tripod and gauze pH probe wash bottle insert anything else you need insert anything else you need

1. Weigh out three, 1.0 g samples of . 2. each of the samples in approximately --- drop down ---. 3. Add --- drop down --- to the fertiliser mixture to --- drop down ---. 4. Add --- drop down --- to the fertiliser mixture to --- drop down ---.

5. the samples to ensure that precipitation goes to completion. 6. Separate the --- drop down --- from the reaction mixture using . Wash the precipitate and equipment with --- drop down ---.

7. the precipitate in an oven or desiccator. 8. Record the final --- drop down --- of the precipitate. Once you have finished your method, complete the materials section above. Print your completed solutions and give it to your teacher to check.